Question : In which year was the Doppler effect discovered by Austrian scientist Christian Doppler, which describes the change in frequency of any kind of sound or light wave produced by a moving source concerning an observer?
Option 1: 1846
Option 2: 1844
Option 3: 1842
Option 4: 1840
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Correct Answer: 1842
Solution : The correct answer is 1842 .
Christian Doppler, an Austrian physicist, initially described the Doppler Effect in 1842. It is visible when the pitch of a vehicle's horn changes as it approaches and recedes from the observer. Christian Doppler first tested the effect of motion on waves by hiring a group of musicians to play on an open railway car as it moved along the track.
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